Device for ramming sand cores.



PATENTED MAR .29, 1904;

G. A. GONRATH. DEVICE FOR RAMMING SAND OORES.

APPLICATION FILED AUG. 6. 1903.

2 SHEETB-SHEET 1.

N0 MODEL.

mvam'on WITNESSES No. 755,620; PATENTED MAR. 29, 1904.

e. A. OONRATH.

DEVICE FOR RAMMING SAND corms.

APPLICATION FILED AUG. 6. 1903.

N0 MODEL. I 2 SHEETS-SHEET 2.

a owmw v 7 W ATE'QNEY RMMQM To all whom/it may concern:

' Fig. 8 is a vertical trout elevation of the up- I per portion of said devicc, show1ng the same in full and in detail, in which drawings GEORGE A. CONRATH, OF BLAIRSVILLE, PENNSYLVANIA, ASSIGLOR TO THE PENN ENAMEL-WARE (30., A CORPORATION OF NEW YORK.

DEVICE FOR RAMIVIING SAN-D CORES- SPECIFICATION'forming part of Letters Patent No. 755,620, dated March 29, 1904. Application filed August 6,1903. Serial No, 168,488. (No model.)

is the cylindrical casing 13, divided into two '50 compartments or chambers 14: and 15 by a central partition 16, one of which chambers communicateswith one end of the main cylinder by a pipe 17 and the other with the opposite Be it known that I, GEORGE A. CONRATH, a i citizen of the United States, residing atBlairsville, in the county of Indiana and State of Pennsylvania, have invented a new and useful Improvement in Devices for Ramming Sand end of said cylinder by a pipe 18. A pair of Cores, of which improvement the fohowing is valve-rods 19 pass through said chambers and a specification. are attached at their ends to lugs upon the This invention has for its object U12 proends of said geauracks, which rods carry slidevision of a power device under the ccusrol of i valves 20 to control the air through the ports the operator adapted se vice in rwnming to and from. the respective ends of the oylin- 6 up green sand cores and molds, part2 aularly I der. A chamber-23issecuredover said ported to cores and molds of large surface area and plate to the cylindrical casing 13, which chamextra depth. llOl' is adapted to receive air through the In the accompanying drawings 1 have by 1 medium of a supply-pipe 24, communicating Various Views illustrated my improved device therewith. To the shaft 25, which is secured to the gear-pinion at the rear and extends through the plates and chambers, is attached an oscillatable valve 26 for controlling the air through the ports 22 to the respective ohamhers, said shaft being provided with a handle 27 to oscillate the same.

In practice the mold to be operated upon is moved beneath the device and supplied with a suiiicicnt quantity of sand. The operator then grasps the handle 27 and moves the same the required distance--say to the left. Now as the valves 20 are adapted to move in opposite directions and in parallel relation and the valve 26 is adapted to perform an oscillating move- Figure 1 is a vertical front elevation oi the device detached from its vertical support. Fig. 2 is a similar view of the same in longitudinal section, showing the interior arrang Inent. Fig. 3 is an enlarged rear view of the f valve -..chamber and attending parts disconl nected from the cylinder on the line a :1: of Fig. 2. Fig. 4 is a side view of the same. I Fig. 5 is a front View of said valvc-chamber having the front portion disconnected at line i Y Y of Fig. 4. Fig. 6 is a rear view of the 3 front portion of said chamber, showing the 1 ports. Fig. 7 is a front view of the same, i showing the valve for controlling said ports.

said handle the ports 8 and 22 on the left will be open and those on the right closed, permitting the air to pass therethrough tothe upper end of the cylinder, causing the piston i to descend and the ramming-head carried 5 the parts of said device and their assemblage, 1 thereby to compress the sand in the mold. the numeral 1 designatcsa cylinder suspended The handle being then turned in an opposite at its upper end from a carriage 2, which is or right-hand direction opens the ports on that travelable upon a track 3, said cylinder hav- 1 side, permitting the air to pass therethroughsuspended from its overhead carriage.

Further referring to the views of said drawlugs collectively for a detailed description of ing fitted therein a piston i, the rod of which to the lower end of the cylinder, causing the 9 is provided witharamming-head 6. Attached 1' piston to again be elevated. By alternately to the side of said cylinder is a plate 7, proturning the handle from left to right the pisvided with ports 8, registering with similar 1 ton carrying the ramming-head is caused to ports in said cylinder. This plate is provided 2 descend and compress the sand and be returned upon its rear surface where it engages with to its former elevated position, the air from the cylinder with countersunk seats 9 and ll) the inactive end of the cylinder being exfor the reception of the gem-pinion 11 and I haustcd or returned to the valve-chamber gear-racks l2. Attached to said ported plat-c through the pipes 17.

, ment simultaneously therewith by turning 80.

When ramming the sand in the mold, the device is moved upon its truck or carriage, so as to enable the entire mold-surface to be acted upon.

By means of this device much time and labor are saved in preparing the mold, and the sand is more uniformly rammed than is possible by hand. 7

Having thus fully shown and described my invention, What I claim as new, and desire to secure by Letters Patent, is

1. In a power ramming device for sand molds, an engine comprehending a cylinder,

of independent secondary val ve-chambers each provided with a port communicating with said cylinder, parallel reciprocating slide-valves controlling said secondary ports, a primary valve-chamber communicating with the airsupply and with each of said secondary valvechambers by separate ports, an oscillatahle shaft carrying a valve for controlling said primary valve -ports, members operatively connecting sald slide-valves with the member for operating the oscillating valve whereby they all move simultaneously, and exhaust passage-ways leading from each end of v aid cylinder to its respective secondary chambers.

air-supply and with each of said secondary valve-chambers by separate ports, an oscillatahle shaft carrying a valve for controlling said primary valve-ports, a pinion carried by said shaft to engage said gear-racks to cause said valves to move simultaneously, and an r exhaust passage- Way leading from each end of said cylinder to its respective secondary valvechamher. the ramming-head of said device being attached to the engine-piston, as set forth.

In testimony whereof l have hereunto signed in name in the pwsence of two subscribing nitnesses.

GEORGE A. CONRATH.

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